請問 為什麼when後面的動詞會加ed

Dynamic motor function of an individual finger when accompanied by alternate movement of another finger

請問 為什麼when後面的動詞會加ed??

可否解釋句子的中文意思和結構....勿用翻譯軟體....

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  • 1 decade ago
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    其實when accompanied by....是when it is accompanied by...的簡略用法,因為是用被動語態 be+Ved,所以後面的動詞會加ed!

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